Photographic sensitive materials for color diffusion transfer process

Abstract

Photographic sensitive materials for a color-diffusion transfer process which are particularly useful in a wide variety of temperature and climate conditions are disclosed. The materials are comprised of a red-sensitive emulsion layer; a green-sensitive emulsion layer; and a blue-sensitive emulsion layer on a support wherein at least one of the layers is comprised of a plurality of additional layers. Two or more of the additional layers are direct reversal photographic emulsion layers of higher and lower sensitivity which are not previously fogged. The emulsion layer having lower sensitivity has a gradation of 1.8 or more resulting in a hard tone.

What is claimed is: 
     
       1. A photographic sensitive material for a color-diffusion transfer process comprising: a support;   a red-sensitive emulsion layer on said support;   a green-sensitive emulsion layer on said support; and   a blue-sensitive emulsion layer on said support, wherein one of said layers is comprised of a plurality of additional layers including a plurality of direct reversal photographic emulsion layers having higher and lower sensitivity which were not previously fogged, and further wherein said direct reversal photographic emulsion layer having lower sensitivity has a gradation of 1.8 or more.     
     
     
       2. A photographic sensitive material as claimed in claim 1 having higher and lower sensitivity differ in sensitivity by about 0.2 or more as a unit of log E. 
     
     
       3. A photographic sensitive material as claimed in any of claims 1 or 2 wherein said emulsions are comprised of silver halide emulsion comprising a hydrophilic colloid dispersion of silver chloride, silver bromide, silver chlorobromide, silver chloroiodobromide or mixtures thereof. 
     
     
       4. A photographic sensitive material as claimed in claim 3 wherein said silver halide emulsion has an iodine content of 10% by mole or less and a chloride content of 30% by mole or less.